New installation 21.1 stuck at booting

[extreme-80]

Hello everybody,
after several searches, i'm still zero, i can't install OPN on an HP Prodesk ... i always installed OPN without any problem, on every type of machine ... in this case i don't really understand what's wrong.

Here in the forum I found various posts with similar problems:
https://forum.opnsense.org/index.php?topic=22253.msg105504#msg105504
https://forum.opnsense.org/index.php?topic=20589.msg95790#msg95790
But even trying the various solutions indicated, nothing worked ... so I would like to talk to you, because at this point the problem is really out of my reach and I need a hand.

Obviously I have already tried to re-download the image, to use different USB sticks, but nothing helped.

Anyone have any ideas or suggestions? TNX!